They are NPT which is tapered the further they thread on the tighter it should get mine aren't bottomed out of that's what you mean. 3/4 garden hose thread doesn't work very well with it easy to cross thread and slip
get rid of the brass rings you say and use something stainless steel any suggestions or link’s would be greatly appreciated .
@Lil Dab some modifications after your suggestion Don’t believe i will be having any leaks now thaanks
@Lil Dab can you give me some advice on setting this up